JPS60209222A - Dust collecting device - Google Patents

Abstract

PURPOSE:To reduce energy cost and installation cost of a dust collecting device by providing a pressure sensor and a speed sensor to a dust collecting device, feeding an input signal from the sensor to an operating circuit and controlling the number of revolutions of a blower basing on an instruction signal from the operating circuit. CONSTITUTION:A coke guide car 13 is sent to an oven which has reached a coke cake pushing stage in a coke oven 1. A dust collecting hood 15 and a dust collecting duct 2 are communicated by opening a damper 4 of a suction port 3. Simultaneously, a sensor 18 for sensing opening or closing of the damper is turned ON, and a signal is dispatched to a revolution controller 20 through a controller 10; thus, a driving motor 7 is regulated to a desired number of revolution to increase the quantity of the sucked air of the blower 8, and the dust- contg. gas is led to a dust collector 6 and treated for dust collection. When pushing of coke cake is finished, the damper is closed and the sensor for the damper is turned OFF to actuate the revolution number controller. Thus, the number of revolution of the driving motor for the blower is reduced to the minimum number and consumption of electric power is saved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a dust collector for dust gas mainly generated from a coke oven, etc. are provided with suction ports with normally closed connection dampers facing each other so that they can be individually connected, and when dust is generated from any of the above dust generation sources, the connection damper of the suction port opposite thereto is opened and connected. The present invention relates to a dust collector that conducts dust gas generated from a dust source through the dust collection duct to a collector 1Iva by suction by a suction blower for dust collection processing.

[Technical background of the invention and its problems]

Generally, to collect dust from the guide wheel, kiln mouth, or extruder in a coke oven, a long dust collection duct is installed above the coke oven in parallel with the direction of the oven rows. In other words, a suction port with a normally closed connection damper is provided protruding from each of the multiple windows of the coke oven with an interval between them, and the ends of the dust collection ducts 1 to 1 are connected to a dust collector and are further connected to a suction blower. It is electrically connected to the exhaust stack through the exhaust pipe. The dust gas generated during coke oven work is connected to the suction port facing the dust generation point by opening its connection damper, and is then conducted to the dust collector through the dust collection duct and collected by the blower suction. After processing the dust, it is discharged as clean gas from the exhaust pipe using a blower.

When dust is generated due to the coke oven operation, the rotational speed of the blower is set to a point sufficient to ensure a suction air volume commensurate with the amount of dust generated by a signal such as the opening operation of the above-mentioned connected damper. When the damper is closed and there is no dust generation, the blower rotation speed is lowered to the minimum to save energy such as power consumption.

By the way, in the above-mentioned dust collector, the closer the suction port for dust collection is to the dust collector, the smaller the pipe resistance in the dust collection duct becomes, and the suction air volume increases inversely proportionally to this due to the blower characteristics. For this reason, the capacity of the blower is determined based on the suction air volume required at the suction port farthest from the dust collector, but the capacity of the blower's drive motor is determined based on the conditions at the suction port closest to the dust collector. In other words, the motor capacity is selected to be larger than the blower's wind ■ and characteristic curve (static pressure straight line) so that the motor does not overload even if the air flow increases excessively due to the reduced conduit resistance due to the blower characteristics. Therefore, in the conventional model, there are only 1 suction port! As the machine approaches the machine, more air than necessary is sucked in, resulting in an uneconomical problem in that power costs are wasted and large equipment costs are required.

(Purpose of the Invention) This invention was made in view of the above circumstances, and its purpose is to provide a very economical dust collector that can solve the conventional problems and effectively reduce both power costs and equipment costs. do.

[Summary of the invention]

In order to achieve the above object, the dust collector of the present invention provides a suction port with a normally closed connection damper that faces a dust collection duct installed along a plurality of dust sources so as to be connectable to each of the dust sources individually. are provided respectively, and when dust is generated from any of the dust sources, the connecting damper of the suction port opposite thereto is opened and connected, and the dust gas generated from the dust source is passed through the dust collection duct. In a dust collector that conducts dust collection by connecting to a dust collector through suction from a suction blower, a pressure or speed detector is provided in the dust collection duct, and an input signal from this detector is used to control a preset required constant air volume. From the static pressure curve based on the blower characteristics using the pipe resistance of the dust collection duct as a barometer as a standard, we have installed an arithmetic circuit that calculates the blower rotation speed required to obtain a constant air pressure according to the set value, and from this calculation circuit. A rotation speed controller is provided for controlling the rotation speed of the blower based on the rotation speed command signal to keep the mouth of the dust collecting duct constant.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

Here, we will discuss as an example the guide wheel dust collection of dust gas generated during coke cake extrusion work in a coke oven. First of all, Fig. 1 is a layout diagram showing a schematic configuration of the entire dust collector. In the figure, 1 is a coke oven with a large number of coke ovens installed in a horizontal row, and a long dust collection duct runs parallel to the direction of the oven rows. 2
is permanently installed. This dust collection duct 2 has suction ports 3 protruding from each other at equal intervals in the longitudinal direction, that is, facing the multiple lights of the coke oven 1. A closed connection damper 4 is installed. The end of the dust collecting duct 2 is connected to a dust collector 6 such as a bag filter installed on the ground via a connecting duct 5, and a suction blower 8 which is rotationally driven by a drive motor 7.
The exhaust pipe 9 is electrically connected to the exhaust pipe 9. Further, in the figure, 10 is a control panel that controls the operation of the drive motor 7 of the blower 8, and 11 is the eastern 11M part of the dust collection duct 2! This is a pressure detector installed near the 6 side. An electric emergency air intake damper 12 is provided at the end of the dust collection duct 2.

Next, FIG. 2 is an enlarged sectional view taken along the line ll-ff in FIG. 1, in which a guide car 13 and a fire extinguisher 14 are installed so as to be able to run along a rail along the side of the coke oven 1 from which the coke cake is extruded. A dust collection hood 15 is attached to the guide wheel 13, and a connector 16 that is vertically extendable and retractable is provided at the top of the dust collection hood 15, and this connector 16 is raised by a drive mechanism 17 such as an air cylinder to It can be connected to the suction port 3 of the dust collecting duct 2 and the connecting damper 4 there can be opened. The connector 16 is provided with a damper opening/closing detector 18 such as a limit switch that is turned on when connected to the suction port 4 due to this rise, and the detection signal is wirelessly transmitted from a transmitter 19 provided on the guide car 13. The signal is sent to the control panel 10 via an induction antenna wire (not shown) stretched along the traveling direction of the guide vehicle.

Here, the control panel 10 has the following steps as shown in the flow diagram in FIG.
When the damper open/close detector 18 is OFF, that is, when the connected damper 4 is closed, a command to close the emergency air intake damper 12 is issued, and the rotation speed controller 20 controls the drive motor to rotate the blower 8. It functions to lower the number of rotations to a predetermined minimum number. Also, the damper opening/closing detector 18 is
N, that is, when the connection damper 4 is open, the detection signal issues a command to close the emergency air intake damper 12, and the signal from the pressure detector 11 of the dust collection duct 2 is transmitted to the receiver 2.
1 receives the input signal, and the arithmetic circuit 22 outputs the blower 8.
The rotation speed controller 20 functions to increase the rotation speed of the blower 8 to a predetermined value based on the rotation speed command signal outputted from the calculation circuit 21. In addition, the above-mentioned sieve circuit 22 uses the blower characteristics as shown in FIG.
Static pressure curve P1 based on the blower characteristics. P2.

The blower rotation speed required to always ensure the constant ff1lQ is set in advance from R3..., and by sending the input signal from the pressure detector 11 to this, the constant air -〇 is obtained. This configuration calculates an appropriate blower rotation speed and outputs a command signal to the rotation speed controller 20.

The operation of the dust collector configured as described above will now be explained. First, when the guide car 13 travels to the kiln of the coke oven 1 where it is time to extrude the coke cake and stops, the connector 16 of the dust collection hood 15 is raised by the drive mechanism 17 and is opposed to the relevant position. At the same time, the normally closed connection damper 4 of the suction port 3 is opened to communicate the dust collection hood 15 and the dust collection duct 2. As a result, the damper opening/closing detector 18, which had been OFF until then, turned ON.
L, the opening signal is sent to the control panel 10, which activates the rotation controller 20 to increase the rotation speed of the drive motor 7 to the required rotation speed and increase the suction air volume of the blower 8. After about 10 seconds, extrusion of the coke cake in the oven is started, and the coke cake is sent from the guide car 13 to the fire extinguisher 14, and a large amount of dust gas generated at this time is collected in the dust collection hood 15, and from there it is sent to the connector 16. The gas is sucked into the dust collection duct 2 through the suction port 3 and passed through the dust collector 6 for dust collection processing, and the gas cleaned there is discharged from the exhaust pipe 9 through the blower 8.

In this way, the dust collection operation is performed, the extrusion of the coke cake in the kiln is completed, and the guide wheel 13 is driven to disconnect the connector 16 from the suction port 3 in order to move to the kiln where the next coke cake is to be extruded. When the mechanism 17 lowers, the connecting damper 4 automatically closes and the damper opening/closing detector 18 turns OFF, which causes the rotation speed controller 20 of the control panel 10 to operate to control the rotation speed of the drive motor 7 of the blower 8. The rotation speed is lowered to the preset minimum rotational speed and the dust collection is suspended. At this time, the electrically operated emergency air intake damper 12 is opened by the connection damper close signal to prevent surging of the blower 12 and to reduce unnecessary power consumption and save energy. Then, when the guide wheel 13 moves to the next target kiln, the dust collection operation is performed again in the same manner as described above.

Here, during the dust collection operation, the rotation controller 20 of the I-board 10 operates to temporarily increase the rotation speed of the drive motor 7 to the required rotation speed under control based on the open signal from the damper opening/closing detector 18. By the way, if the position of the oven for extruding the coke cake in the coke oven 1 changes, the suction port 3 connected to it will also change to one located farther or closer to the dust collector 6, so the dust collection duct 2 Since the piping resistance changes each time, for example, when dust is collected from the suction port 3 near the collector 51616, the piping resistance is small, so there is a problem such as excessive air volume being sucked due to the blower characteristics and the drive motor 7 being overloaded. arise. For this reason, in the past, a drive motor with a large capacity was used in advance in consideration of such problems, but in the case of the present invention, the rotation speed of the drive motor 7, which has been increased once, is adjusted to the suction air volume in the dust collection duct 2. The air flow rate in the dust collecting duct 2 is controlled according to the air flow rate so as to always maintain a preset constant air flow IQ. That is, during the dust collection operation, the static pressure inside the dust collection duct 2 is detected by the pressure detector 11, and the detection signal is sent from the receiver 21 of the control panel 10 to the calculation circuit 22.
The input signal causes the arithmetic circuit 22 to control the blower 8.
Calculate the appropriate rotation speed of the
Based on the static pressure curve based on the blower characteristics using the piping resistance of the dust collection duct 2 as a barometer, calculate the appropriate rotation speed necessary to always obtain a constant air volume Q according to the set value according to the pressure detection signal, The rotation speed command signal is sent to the rotation controller 20, and the rotation speed of the drive motor 7 of the blower 8 is controlled by the rotation controller 20 according to the command. As a result, no matter where the dust is collected from the suction port 3 in the dust collection duct 2, the dust gas can be sucked in at a constant I'll and the dust can be collected.

For example, in a dust collection duct 2 installed in a coke oven 1 with 50 gates, there is a 10 to 20% difference in piping resistance between suction from the suction port 3 near the dust collector 6 and suction port 3 far from the dust collector 6.
If the capacity of the drive motor 7 is selected in accordance with the conditions of the suction port 3 closest to the dust collector 6, taking into account overload due to blower characteristics as in the past, a motor with a considerably large capacity is required, but as mentioned above, If the rotation speed is controlled to keep the air volume constant according to the blower characteristics, select a motor 7 with sufficient capacity to secure the air volume necessary for dust collection from the farthest suction port 3, which has the highest piping resistance. All you have to do is to use a motor with about 10% smaller output. This reduces equipment costs and reduces operating costs.

Note that the present invention is not limited to the above-mentioned embodiment, and for example, a speed detector that obtains the air volume from the wind speed may be used instead of the pressure detector 11.

Moreover, it can be applied to various dust generation sources other than coke ovens.

〔Effect of the invention〕

Since the present invention is made as described above, it is possible to solve the conventional problems and provide a very economical dust collector that can effectively reduce both power costs and equipment costs.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of the entire device, FIG. 2 is a partially enlarged view taken along the line ■-■ in FIG. 1, and FIG. 3 is a control panel. Rotation speed control flow diagram,
FIG. 4 is a blower characteristic diagram. 1... Coke oven, 2... Dust collection duct, 3... Suction port, 4... Connection damper, 5... Connection duct, 6
... dust collector, 7 ... drive motor, 8 ... blower,
9... Exhaust pipe, 10... Control panel, 11... Pressure detector, 12... Emergency air intake damper, 13...
Guide car, 14... Fire extinguisher, 15... Dust collection hood,
16... Connector, 17... Drive mechanism, 18...
Damper opening/closing detector, 19... Transmitter, 20... Rotation controller, 21... Receiver, 22... Arithmetic circuit. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] Each of the above-mentioned I! Each suction port with a normally closed connection damper is provided facing each other so as to be individually connectable to the source, and when dust is generated from any of the dust generation sources, the connection damper of the suction port opposite thereto is opened and connected, In the dust collection device that conducts dust gas generated from the dust source through the dust collection duct to a dust collector by suction by a suction blower to collect dust, the dust collection duct is provided with a pressure or speed detector, and the dust collection device is provided with a pressure or speed detector. Based on the input signal from the detector, the static pressure curve based on the blower characteristics using the pipe line resistance of the dust collection duct as a barometer is determined based on a preset required constant Jul amount.
A calculation circuit is provided to calculate the blower rotation speed necessary to obtain the amount, and the rotation speed of the blower is controlled based on a rotation speed command signal from the calculation circuit to keep I'll of the dust collection duct constant. A dust collector characterized in that it is configured with a rotation speed controller.